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External Monitor Not Working Windows 8 64bit MacBook Pro 15 2012

Posted on 2013-06-22
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Last Modified: 2014-10-26
I just picked up a new MacBook Pro 15" 2012 model.  It's not the retina display.  I already had a 2009 MacBook 13" white that I've been running for a few years.  I was running BootCamp on my other MacBook, running Lion on the Mac OS side and Windows 7 on the Bootcamp side.  I have an external monitor  (LG) at home and a Samsung monitor at the office.  I am using the mini display port to DVI adapter to run an external monitor between Lion and Windows 7 32bit just fine.
I plugged in the mini display port to dvi plug into the new MacBook Pro and poof..my external monitor worked just fine in Mountain Lion but when I reboot to the Windows 8 64 bit side of things in boot camp. No go.  It doesn't even see the external monitor or anything I've plugged into it.
I know the cable is fine and the adapter is fine because it works on the Mountain Lion side of things. I'm thinking it is something to do with thunderbolt on the Windows side of things and that I'm missing a driver or something but I've tried for two days to get this thing working and I can't.
Does anybody have any ideas on how to get Windows 8 64bit to recognize an external monitor connected to it?
Thank you very much!
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Question by:rcavins
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by:Giladn
ID: 39268213
can you please open device manager -
http://pcsupport.about.com/od/windows-8/a/device-manager-windows-8.htm

then plug the  mini display port and see if there's change in device manager.
also look for unkown devices or devices with exclamation mark that has error, if non of the above works try installing the new drivers, you can find all you need for windows here:
http://www.apple.com/support/bootcamp/

post back

G
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Author Comment

by:rcavins
ID: 39268671
Nothing changes in the device manager.  I went out and picked up a mini display port to vga adapter to try another monitor I have and still nothing.  I'm running boot camp 5, which is supposed to support thunderbolt/mini-display but I'm not getting anywhere.
What driver should I be looking for? The graphics drivers or something with thunderbolt?  I've downloaded the latest firmware update to thunderbolt and it said that it was up to date.
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by:Giladn
ID: 39269048
if you leave the monitor connetced and reboot again to windows does it work? try to let windows load when the monitor is connected and post back..
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by:Giladn
ID: 39269051
did you try pressing option key(start key)+P  to change displays?
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by:strung
ID: 39269322
According to http://support.apple.com/kb/TS4531

This might solve your problem:

Disable the Windows 8 Fast Boot feature to allow Thunderbolt devices to be recognized.

1. Start up in Windows.
2. Position your mouse cursor in the upper-right or lower-right corner of your screen to activate the Charms bar.
3. Click on the Settings icon.
4. Click Control Panel.
5. Choose "Hardware and Sound."
6. Under Power Options, choose "Change what the power buttons do."
7. Under "Shutdown settings," remove the checkmark from "Turn on fast startup."

Click on Save changes.
Restart your computer. After restarting, devices connected to Thunderbolt ports should be recognized.

See also:  See:  http://support.apple.com/kb/HT5628
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rcavins earned 0 total points
ID: 39346822
I'm so sorry I haven't updated this ticket.  I thought I had closed it out.  I ended up installing Windows 7 and the boot camp drivers for it and then I upgraded to Windows 8.
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